Jiomart — Empty BOX delivered

I have ordered Protein Power of 2kg worth of 5000/- on 1st July via Jiomart.
Initially it was mentioned it will deliver by 9th but It got delivered on 5th July.
But when i open the box I found inside only paper card board no Protein box. So Immediately I escalate to customer care and got reply that we will refund your money within 15days. Now its almost 20days and Jiomart informing your packet delivered without any tampering so we cant do anything. I used to order through Amazon this time thought let me try via Jiomart but very worst experience. No support from jiomart response is slow and worst.